New Chiral Ferrocenyl P,S-Ligands for Highly Diastereo-/Enantioselective Catalytic [3 + 2] Cycloaddition of Azomethine Ylides with Cyclic and Acyclic Enones
作者:Cheng Zhang、Sai-Bo Yu、Xiang-Ping Hu、Dao-Yong Wang、Zhuo Zheng
DOI:10.1021/ol1024647
日期:2010.12.3
developed and successfully applied in a highly endo-selective catalytic asymmetric cycloaddition of azomethine ylides with various enones, including cyclic and acyclic α-enones. For cyclic α-enones, a [Cu(CH3CN)4]ClO4/(Rc,SFc)-2f complex catalyzed the cycloaddition to give the sole endo-cycloadducts in perfect enantioselectivities (normally 99% ee), while an AgOAc/(Rc,SFc)-2f catalytic system exhibited good
已经开发了新的手性二茂铁基P,S-配体家族,并将其成功地用于偶氮甲亚胺与各种烯酮(包括环状和非环状α-烯酮)的高内选择性催化不对称环加成反应。对于环状α-烯酮,一个物[Cu(CH 3 CN)4 ] CLO 4 /([R ç,小号的Fc) - 2F络合物催化,得到唯一的环加成内切在完美的对映选择性(通常99%ee)的-cycloadducts,而一个AgOAc /([R ç,小号的Fc) - 2F催化体系显示出良好的内/外环选择性(内/外= 91/9至96/4)和无环α-烯酮的高对映体控制(高达98%ee)。